Shunsuke Hayami is an internationally competing professional race car driver. Born to German father Georg Kaiser and a Japanese mother whose name remains undisclosed, he is biracial. His background features multiple championship wins across various countries, establishing him as world-class prior to the main story.

His career suffers a major setback when a critical error during the Japanese Grand Prix leads to his dismissal from his team, effectively ending his established trajectory. Following this downfall, Ginjiro, an old friend of his deceased father, intervenes. Ginjiro offers Shunsuke a place on his racing team, insisting Shunsuke possesses too much potential to leave the sport.

Concurrently, Shunsuke inherits the Ruben Kaiser, a specialized Formula One race car designed and built by his late father. This vehicle becomes central to his future racing career. Accepting Ginjiro's offer, Shunsuke resumes competitive driving to restore his own reputation and honor his father's legacy and dreams.

Personality-wise, he displays high intelligence and a notably cool demeanor. He is also exceptionally handsome, attracting considerable attention. On track, his primary rival is Hideto, Japan's top racer; Shunsuke consistently ranks just behind him and strives to close this gap after his professional setback.

His story arc concludes with his continued efforts to achieve racing success using the Ruben Kaiser, symbolizing his connection to his father and his personal redemption within the sport.